Biodegradable Polymer-Curcumin Conjugate Micelles Enhance the Loading and Delivery of Low-Potency Curcumin
作者:Rulei Yang、Suai Zhang、Deling Kong、Xuli Gao、Yanjun Zhao、Zheng Wang
DOI:10.1007/s11095-012-0848-8
日期:2012.12
To utilize a novel type of polymer-drug conjugate micelle to enhance the delivery of low-potency curcumin. Multiple curcumin molecules were conjugated to poly(lactic acid) (PLA) via tris(hydroxymethyl)aminomethane (Tris) linker producing the hydrophobic drug-binding block; methoxy-poly(ethylene glycol) (mPEG) was employed as the hydrophilic block. Micelles were characterized by size, loading capacity, stability, and critical micelle concentration (CMC). Human hepatocellular carcinoma (HepG2) cells were employed to assess cytotoxicity and intracellular targeting ability of micelles. mPEG-PLA-Tris-Cur micelles were within nanorange (<100 nm). CMC of such micelles (2.3 ± 0.4 μg/mL) was 10 times lower than mPEG-PLA micelles (27.4 ± 0.8 μg/mL). Curcumin loading in mPEG-PLA-Tris-Cur micelles reached 18.5 ± 1.3% (w/w), compared to traditional mPEG-PLA micelles at 3.6 ± 0.4% (w/w). IC50 of mPEG-PLA-Tris-Cur micelles (~22 μg/mL at curcumin-equivalent dose) was similar to unmodified curcumin. Placebo and drug-encapsulated conjugate micelles could be efficiently internalized to cytoplasmic compartment of HepG2 cells. Micelle-forming polymer-drug conjugates containing multiple drug molecules were an efficient means to increase loading and intracellular delivery of low-potency curcumin.
利用新型聚合物-药物缀合物胶束来增强低效姜黄素的递送。多个姜黄素分子通过三(羟甲基)氨基甲烷(Tris)连接体与聚乳酸(PLA)缀合,产生疏水性药物结合块;采用甲氧基聚乙二醇(mPEG)作为亲水嵌段。胶束的特征包括尺寸、负载能力、稳定性和临界胶束浓度 (CMC)。使用人肝细胞癌细胞(HepG2)来评估胶束的细胞毒性和细胞内靶向能力。 mPEG-PLA-Tris-Cur 胶束在纳米范围内(<100 nm)。这种胶束的 CMC (2.3±0.4 μg/mL) 比 mPEG-PLA 胶束 (27.4±0.8 μg/mL) 低 10 倍。 mPEG-PLA-Tris-Cur 胶束中的姜黄素负载量达到 18.5±1.3% (w/w),而传统 mPEG-PLA 胶束的姜黄素负载量为 3.6±0.4% (w/w)。 mPEG-PLA-Tris-Cur 胶束(姜黄素当量剂量下约为 22 μg/mL)的 IC50 与未修饰的姜黄素相似。安慰剂和药物封装的缀合物胶束可以有效地内化到 HepG2 细胞的细胞质区室中。含有多个药物分子的胶束形成聚合物-药物缀合物是增加低效姜黄素的负载和细胞内递送的有效方法。